Nginx服务器中使用lua获取get或post参数

 　　使用ngx_lua模块(http://wiki.nginx.org/HttpLuaModule)：,　　local request_method = ngx.var.request_method,　　local args = nil,　　local param = nil,　　local param2 = nil,　　--获取参数的值,　　if "GET" == request_method then,　　args = ngx.req.get_uri_args(),　　elseif "POST" == request_method then,　　ngx.req.read_body(),　　args = ngx.req.get_post_args(),　　end,　　param = args["param"],　　param2 = args["param2"],　　升级版(能处理content-type=multipart/form-data的表单)：,　　local function explode ( _str,seperator ),　　local pos, arr = 0, {},　　for st, sp in function() return string.find( _str, seperator, pos, true ) end do,　　table.insert( arr, string.sub( _str, pos, st-1 ) ),　　pos = sp + 1,　　end,　　table.insert( arr, string.sub( _str, pos ) ),　　return arr,　　end,　　local args = {},　　local file_args = {},　　local is_have_file_param = false,　　local function init_form_args(),　　local receive_headers = ngx.req.get_headers(),　　local request_method = ngx.var.request_method,　　if "GET" == request_method then,　　args = ngx.req.get_uri_args(),　　elseif "POST" == request_method then,　　ngx.req.read_body(),　　if string.sub(receive_headers["content-type"],1,20) == "multipart/form-data;" then--判断是否是multipart/form-data类型的表单,　　is_have_file_param = true,　　content_type = receive_headers["content-type"],　　body_data = ngx.req.get_body_data()--body_data可是符合http协议的请求体，不是普通的字符串,　　--请求体的size大于nginx配置里的client_body_buffer_size，则会导致请求体被缓冲到磁盘临时文件里，client_body_buffer_size默认是8k或者16k,　　if not body_data then,　　local datafile = ngx.req.get_body_file(),　　if not datafile then,　　error_code = 1,　　error_msg = "no request body found",　　else,　　local fh, err = io.open(datafile, "r"),　　if not fh then,　　error_code = 2,　　error_msg = "failed to open " .. tostring(datafile) .. "for reading: " .. tostring(err),　　else,　　fh:seek("set"),　　body_data = fh:read("*a"),　　fh:close(),　　if body_data == "" then,　　error_code = 3,　　error_msg = "request body is empty",　　end,　　end,　　end,　　end,　　local new_body_data = {},　　--确保取到请求体的数据,　　if not error_code then,　　local boundary = "--" .. string.sub(receive_headers["content-type"],31),　　local body_data_table = explode(tostring(body_data),boundary),　　local first_string = table.remove(body_data_table,1),　　local last_string = table.remove(body_data_table),　　for i,v in ipairs(body_data_table) do,　　local start_pos,end_pos,capture,capture2 = string.find(v,Content%-Disposition: form%-data; name="(.+)"; filename="(.*)"),　　if not start_pos then--普通参数,　　local t = explode(v,"rnrn"),　　local temp_param_name = string.sub(t[1],41,-2),　　local temp_param_value = string.sub(t[2],1,-3),　　args[temp_param_name] = temp_param_value,　　else--文件类型的参数，capture是参数名称，capture2是文件名,　　file_args[capture] = capture2,　　table.insert(new_body_data,v),　　end,　　end,　　table.insert(new_body_data,1,first_string),　　table.insert(new_body_data,last_string),　　--去掉app_key,app_secret等几个参数，把业务级别的参数传给内部的API,　　body_data = table.concat(new_body_data,boundary)--body_data可是符合http协议的请求体，不是普通的字符串,　　end,　　else,　　args = ngx.req.get_post_args(),　　end,　　end,　　end,